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5. Creating Surrogate Key
Surrogate Key is the unique identifier in any table. It is important to create a relationship between the two tables. This key acts as a primary key in one table anf foreign key in the other.
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6. Merging Queries
Merging queries involves combining two data tables based on a common column. This column should have similar values in the both tables.
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7. Creating Calculated Columns
Calculated Columns are created to provide you with insights related to your data set and make data visualization easy and meaningful.
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Flattening of the table refers to linking the tables attached to the ends of the schema. In data modeling terminology it means changing the snow flake to star schema because star schema is the most preferred data model by industry experts.
Flattening of Product table is important due to two reasons. Firstly, it helps to organizes the data model and secondly, hierarchy can be created in the same table of the data model.
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- Creating Product Hierarchy
Power BI allows you to create Product Hierarchy for columns present in the same table.
To create Product Hierarchy:
1. Click on Model Tab in the left Ribbon.
2. Right Click on Product.
3. Click on Create Hierarchy.
4. In the General Section, Type Product Hierarchy in the Name field.
5. In the Advanced Section, Click on Product Type in the Hierarchy drop-down menu.
6. In the Advanced Section, Click on Product Line in the Hierarchy drop-down menu.
7. Click on Apply Level Changes in the Advanced Section.
Notice that a Product Hierarchy is created in the Product Table with Product lowest level of granularity and the Product Line as the highest grain.
A data model consists of the right tables linked to each other with the correct relationship between them. This may seem as simple as loading the data into Power BI and creating the relationship using drag and drop. But in reality, it is not. When the data model is created in the form of star schema, many problems start to emerge such as missing surrogate key and hanging dimensions. Another commonly used feature is the hierarchy. However, hierarchy cannot be created unless all the columns are present in the same table.
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